131 lines
3.6 KiB
Plaintext
131 lines
3.6 KiB
Plaintext
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Tegra-skin driver binding
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-------------------------
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NVIDIA tegra skin driver estimates skin temperature of tegra devices. This
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virtual sensor(s) is registered to Generic Thermal Framework and has the option
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to expose estimated skin temperature value(s) at multiple points (hotspots) on
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the device.
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/tegra_skin_thermal
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Required properties:
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- compatible:
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- should be "nvidia,tegra-skin-thermal"
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- #thermal-sensor-cells: should be 1. See ./thermal.txt for details.
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Optional properties:
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- io-channels: iio channels that the driver is expected to poll
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- io-channel-names: channel names in the order of io-channels that the
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driver is expected to poll
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- skin-sensor@<N>:
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- See below for details
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- power_feature@<N>:
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- See below for details
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- hotspot@<N>:
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- See below for details
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/tegra_skin_thermal/skin-sensor@<N>
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Required properties:
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- thermal-sensor
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- should match the thermal sensor id used in the thermal-sensors
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attribute in the thermal-zone definition.
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For Example, in thermal zone definition if
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thermal-sensors = <&{/tegra_skin_thermal} 2>;
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then thermal-sensor should be 2.
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- hotspot-list
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- comma separated phandle list to hotspot definition. The sensor
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would return the max temperature reported by each hotspot.
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See below for hotspot configuration.
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/tegra_skin_thermal/hotspot@<N>
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Define the attributes of each hotspot
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Required properties
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- power-features-list: comma separated phandle, arguments list to
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power feature definition. The number of arguments is defined by
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#power-feature-cells of the respective power feature.
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- offset: offset of hotspot
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- rc_k: damping coefficient of hotspot
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- reference-sensor: reference sensor used by the hotspot estimator
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/tegra_skin_thermal/power_feature@<N>
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Required properties
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- type: could be IIO_SUBSYSTEM, BACKLIGHT_BRIGHTNESS
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- rc_k: damping coefficient for the power_feature
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- resistance: thermal resitance of the power feature
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- #power-feature-cells: number of arguments for the power-feature in
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power-features-list
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/tegra_skin_thermal/skin-sensor@<N> is registered as a Thermal Zone using the
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thermal framework. See ./thermal.txt for more details.
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Example:-
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#include <dt-bindings/thermal/thermal.h>
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#include <dt-bindings/thermal/tegra186-skin-thermal.h>
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#include <dt-bindings/iio/meter/ina3221x.h>
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/ {
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tegra_skin_thermal {
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compatible = "nvidia,tegra-skin-thermal";
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#thermal-sensor-cells = <1>;
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io-channels = <&ina3221x_40 INA3221_CHAN_INDEX(0, VOLTAGE, NORMAL)>,
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<&ina3221x_40 INA3221_CHAN_INDEX(0, CURRENT, NORMAL)>,
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<&ina3221x_41 INA3221_CHAN_INDEX(0, POWER, NORMAL)>;
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io-channel-names = "gpu-voltage", "gpu-current", "vddin-power";
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pf_backlight: power_feature@0 {
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#power-feature-cells = <1>;
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type = <BACKLIGHT_BRIGHTNESS>;
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rc_k = <1>;
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resistance = <1>;
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};
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pf_iio_ina3221: power_feature@1 {
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#power-feature-cells = <1>;
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type = <IIO_SUBSYSTEM>;
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rc_k = <1>;
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resistance = <1>;
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};
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hs0: hotspot@0 {
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power-features-list = <&pf_backlight &lp8557_backlight
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&pf_iio_ina3221 0
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&pf_iio_ina3221 1>;
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offset = <3>;
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rc_k = <1>;
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reference-sensor = <&Tboard_tegra>;
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};
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hs1: hotspot@1 {
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power-features-list = <&pf_backlight &lp8557_backlight>;
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offset = <3>;
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rc_k = <1>;
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reference-sensor = <&Tboard_tegra>;
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};
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hs2: hotspot@2 {
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power-features-list = <&pf_backlight &lp8557_backlight
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&pf_iio_ina3221 2>;
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offset = <3>;
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rc_k = <1>;
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reference-sensor = <&Tboard_tegra>;
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};
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skin-sensor@0 {
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thermal-sensor = <0>;
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hotspot-list = <&hs0 &hs1>;
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};
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skin-sensor@1 {
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thermal-sensor = <1>;
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hotspot-list = <&hs1>;
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};
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skin-sensor@2 {
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thermal-sensor = <2>;
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hotspot-list = <&hs2>;
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};
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};
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};
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